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Thread: Glow Plug Relay Repair

  1. 4th June 2021, 03:20 PM #1
    Rick
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    Glow Plug Relay Repair

    I know there is little need for the glow plugs in Australia but for members in cooler climates I'll share how I fixed the relay that would stick in a closed circuit keeping the plugs on all the time.

    I opened the relay and found 3 electrolytic 100uF capacitors. 1 rated at 10 volts and the other 2 at 16 volts. I have a fancy meter that showed the caps were no good so for a grand total of $1.26 I purchased 16 volt replacements for all 3. At about 1/100th the price of the new replacement relay it's back working again, if I ever need it. Not now, though, I've pulled out the 60A fuse to the glow plugs.

    Relay.jpg
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  2. 4th June 2021, 05:21 PM #2
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    p38arover
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    Are the caps part of a timer circuit?

    (Do you have an ESR meter?)
    Ron B.
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  3. 4th June 2021, 05:37 PM #3
    Rick
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    I think 2 of the caps, in parallel, may be part of a timing circuit. I didn't trace it all out. My meter does ESR and the old caps showed high ESR and low capacitance. There wasn't more than about $5 worth of parts inside. Even the IC is only just over $1.
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  4. 4th June 2021, 10:59 PM #4
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    101RRS
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    Rick that's great but what vehicle and engine are you talking about - I assume not my 2.7 TDV6.
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  5. 5th June 2021, 02:39 AM #5
    Rick
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    It's part number PRC6913. Mines a 300Tdi but I believe it's used in the 200Tdi as well. Possibly others. I suspect that other relays could be similar in how they work and can be repaired. Not much to be lost to open up a broken one. Hope that helps.
    Last edited by p38arover; 5th June 2021 at 07:21 AM.
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